Stop mechanism for sewing-machines.



PATBNTBD Dnc. 31. v19o?.

' w. N. PARKBS.

STOP MBUHANISM P0P. SEWING MACHINES.

2 SHEETS-SHEET 1.

y APPLICATION FILED IAR. 2B. 1903.

MOR:

No. 875,609-, PATENTED DBC. 31', 1907.

W.A N. PARKES. sm? MEoHANlsM. PoR SEWING MACHINES.

APPLICATION FILED IAB. 28. 1903.

2 SHEETS-SHEET 2.

i y @I *2 u WTNESSES:

UNITED STATES PATENT OFFICE.

WILLIAM N. PARKES, OF BROOKLYN, NEW YORK.

STOP MECHANISM 'FOBA SEWING-MACHINEB.

To all 'whom 'it may concern;

Be it known that I, WILLIAM N. PAnKEs, a citizen of the United States, residing in Brookl county of Kings, and State of New Ybi'llr, have invented a new and' useful Improvement in Sto Mechanism for Sewing- Machines, of which t e following is a description.

` This invention relates to stop mechanism for sewing machines, and particularly to stopm'echanisms which are automaticallyl trip ed into action ata (predetermined time, or ter a predetermine number of operations are completed. A

One of the main objects of m invention 'is to provide improved means for olding a stop motion in its normal or inoperative position, to combine therewith an improved device for actuating said means to tri the motion intol action, and to adapt said evice to be o erated by the movement of -a knot, or t 'ck place, or other obstruction inthe thread as 1t passes from the supply to the needle. It is obviously better to stop the machine beiore,these bad places in the thread reaches -the tension or needle, and thereby avoid the damage-which is caused by the same, and it is. .one of the main objects of my device to. prevent suchjdama'ge. When the lr'not causes the device to act and stop the machine, as in my device, not a single. stitch need be lost, the operator cuts the knot out pulls .the thread thro h, rethreads the needie and starts the mac e again without the loss of a single stitch. This is advantaus'in any machine, but more especially in glitten-hole, and automatic embroidey marhincs sus? asis shown bymein U. Patent No. 65 ,578, button-hole machine, dated September 25, 1900, and No. 693,666 automatic embroidery. machine, dated February 18 1992.

ily present invention may 'be used 1n oonaection with any suitable stop motion device;`

but in this application it is shown in combination with a sto motion device substan- 'all the same as t at which is shown in my .U.- Patent No. 670,163 dated March 19,

With the above object in view, andothers which will be notedfin the com'se of this description, the invention consists in the elements and combinations hereinafter described and claimed. V-

In the drawings: Figure 1 is a reanend ele- Specification of Letters Patent.

y Appunti@ nel: umh as. 190s. sum 11. 149.660.

' vation of a sewing machine, s'ho operative or inoperative is provided with a ilexib e portion 16, of any suitabie shape, to be operated upon by a lift- 100 :satema n. a1, 19o?.

mechanism and my invention applieilA there, .to Fig. 2 1s a rear elevation of t e mechanism shown 1n Fig. 1; Fi 3 is a vertical sec-V tion on the line 3-3 o Fig. 2; Fig. 4 is a' 60 .transverse section'on the line 4 4: o 2;

Fig. 5 is a horizontal sectiozrof Fig. 1 on the line 5 5; Fi s. 6, 7, 8 and 9 are detail views of parts of t e tripping mechanism, 9

being a section on me 11-11 5; and 65 Fig. 10 is a sectional detail showing the rela- `tion of the tripping lever 17 and the latch 15 and details of other parts adjacent thereto.

The frame ofthe machine is indicated by 1; and` 2, is the loose driving pulley carried 70 by the main shaft of the machine ;'3, the fixed driving pulley; 4, the brake-strap or band encircling the peri heryoftheixed pulley, and one end of whic 1s 'eldingly connected, by

means of a series o sprin s 5, to a bracket 6 secured to the frame o the machine, as shown in'Fig. 2.1- The other end of the brakestrap is suitably secured to the hub of the clutch-lever 7, the cam-face 8, of which bears u on the hub of the loose pulley 2. k)The depending arm 9, of the c utch- Alever has connected thereto a spring 10,

which normally tends to draw the ower end of the lever toward the front of the machine and keep the cam portion of said lever out of engagement with the hub of the loose. pulley 2.- he outer end of the spring 10, is connected to an adjustable screw 11, passin through a bracket ieee 12, on the frame o the machine and a o through two holding sai nuts 13, arranged .on opposite sides of bracket 12. y 1

The lower end of the clutch-lever is pivotally connected to a sliding latchbar 14,

provided with suitable depressions in which $5 a s ring-latch 15,- may rest-and hold the late -bar and its connected-lever in either an sition. Thelatch ing or trippin lever 17. The latch 15, is

' fixed at 18 an can only be flexed vertically -to release the latch-bar 14. Ordinarily, the

latch is lifted from the notch by means of a trip ing device carried by some rotary part lei latch-bar 14, at a predetermined time, thus astop allowing the spring 1Q, to operate the lever 7, t'tion to stop the machine. A thread guide and unclutch the driving pulley from the tast i 32, of any suitable character may lead the pulley. sto i-meclianism here described, and its de, 5 taills are iiot further set forth because the saine are not im ortantto my invention. The only essentai is that the stop-mechanism may have a latch, or equivalent device, susceptible of heilig automatically operated, to throw into action the stop-mechanism to stop the sewing, by the device now to be described.

The lever I7, is suitably pivoted to the fraaie of the machine at 20, so as to stand in a substantially vertical position. At its upper end the. lever 17, is provided with a portion 21, which 'may be properly a-nd sutii ciently weighted. as by enlarging the same, as shown in Figs. 2 and 3. .The portion 2, 26 is bored vertically so as to provid'e the soclet 22, for the reception of the thread-guides 23. Said guides may be ordinary, eve-pointedV n edles of the same size as the sewing needles used in the machine; and one or more of such 'guides may be used, according to the number of needle-threads used in the machine. The character of the guides is not essential. except that the opening,r through which the thread passes should be small enough to pre- 30 vent any thick portion of the thread passing through it. that would not. pa freely through the needle. Each guide 23. is 'provided with a thread-eye or guide '24, and is held in ilace by means ol' a screw 25, passing through the lever and bearing against. the shank or stein of the guide 23. The lever 17, is also provided with a transverse bore or eye '26, passing through the socket- 22; and the guides 23, are secured in the` socket with their eyes '24. 40 coinciding with the eye 26,in the lever 17.

The lower end ol` the lever 17, is provided -with an angular extension '27. Fig. l0, which extends under the portion lt. Vig. t), of the latch 15, so that when the icvcr is thrown into the dotted line position ol' ["ig. 2, said extension will litt thc latch 15, from its scat in the latch-bar 14. 'lhc l'ranic is provided with a stop 2s, for limiting the movement ol `the lever 17. when thrown into the dottedline position of Fig. 2 by thc engagement oi a knot in the thread withthe guide 23. 'lhe frame is also provided with an adiustable stop 22|, located adiacent the lowcr end of the lever l?. and against which the said lower end normally rests. 'lhe stop 2U, is in the .form of a pin and slides freely in a bore in the fraaie. or a bracket 3U. thereon, and its` position is regulated by means ol' a screw 31, iassing through the bracket and engaging the pin. By this means, the upper end of .the lever can he iuhitioned with reference to the center olgravity. and so placed as to cnablc the lightest pull thereunto ovcrlmlancc l it. start it into action and cause it to iit the l\' o stress is laid upon the particular thread in line to the tripping lever 17.

The operation of the stop-mechanism will be clear from the above descriptlon; and it will be noted that. the said strop-iiieehamsm is notonly tripped into action at. a predetermined time by the tripping devicel 19X, but may also he tripped into action by the lever 17, which may be termed an "emergency device.

An important feature of this device is simplicity. It will be noted that. the leverlis practically all there is to it except the parts of the stop motion that are adapted to be operated by said device.- And it will benoticed that these vst-op motion arts are not additional stop motion part-s, ut the regular stop motion parts, so the. only mechanism added by applicants device is said lever and thread guides carried by it, and the stop 'pins for limiting the movement of the lever.

Ilavi Y1g thus described my inventionwhat I claim and desire to secure by Letters Pat'- entis:

1. A stop motion for sewing machines, a device adapted to trip said sto motion into action, means separate from tiethread for holding said device out of act-ion, means whereby a knot or thick place in the. thread causes said device to commence to act after which it continues to act independent of said thread until it has tripped said stop :motion into action. t

'2. stop motion for sewing machines, a. device adapted to trip said stop motion into action. means separate from the thread for holding said device out of action, means for guiding a thread through a part ofv said device whereby a knot in the thread causes said device to commence to act after which it continues to act independent of the ,thread until it has tripped said stop 'motion into action.

3. A stop motion for a sewing' machine having a latch disposed in a horizontal plane, a catch disposed in a horizontal plane. at right angles to said latch. a lever adapted to turn in a vertical plane and thereby engage said latch, and means whereby a knot or thick place i'n the thread causes said lever to commence to act after which it continues to act independent of the thread until it has tripped said stop motion into action.

4. A stop :notion for sewing machines having a latchand catch, a lever the lower end of which is adapted to engage said-latch,- the upper end of said lever weighted. astop for said lever against which it normally rests so that gravity prevents it from turning on its pivot. and means whereby a knotjor-thick place in the thread causes said levert@ turn on its pivot and thereby engage said latch.

:1. stop motion for sewing machines hav- 5 latch and trip the stuprimchanisxu inte acing a latch and catch, a pivotedlever the lap lower end of which is ada latch, and the upper en( of said lever prol vided with a needle through which the thread passes in its way to the aforesaid 5 .thread carrying needle.. A

6. A stop motion for sewing machines havingl a latch and catch, a pivoted` lever the lower end, of which is adapted to engage said latch,V the upper end of said lever weighted, saidweighted portion provided With a needle through which they thread passes on its -way to the aforesaid thread carrying needle,A a 'sto against which said lever normally rests, an' a strop for limiting it's action when operated. 7. A stop the latch har. V

8. A stop-mechanism comprisin a latchbar and latch; means for lifting saiV latch ini cludmg a lever; and means for adjusting the l normal-position of the lever to determine the power required to zictuate the same. 9. .A .stop-mechanismcomprising a latch, a. trlppmg lever in engagement with the latch, said lever having' an enlarged weilited portion', a socket' in the latter, and a thread guide housed in the socket.

signed my name in the'presence of two subsoribmg witnesses, i

'WILLIAM N. PARKES.

` mechanism com rising'a latch-V bar and flexible latch for ho ding the same; and a weighted lever cooperating with the latch and which may be caused automat- Witnesses: i

Crus. MCC. CHAPMAN,' M. B. HoARE.

ted to engage said l-ically to ilex the latch by its weight to release,-

In testimony whereof I have hereunto 

